Hi. My periods are usually regular, 28-30 days, but this year they came every 28 days. On day 17 of my last cycle, I had sex. 7 days later after sex again, there was some light blood when I wiped. Next day until now, I've had nausea and cramps. Today, 3 days after my period is due, I have some red spotting. Not a blood flow. And the nausea and cramps haven't changed. Is this a period, or am I pregnant. I had my 2 children 9 and 10 years ago. Never had "implantation" or any other bleeding.